org.springframework.ui.context.HierarchicalThemeSource.java Source code

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Here is the source code for org.springframework.ui.context.HierarchicalThemeSource.java

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/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.ui.context;

import org.springframework.lang.Nullable;

/**
 * Sub-interface of ThemeSource to be implemented by objects that
 * can resolve theme messages hierarchically.
 *
 * @author Jean-Pierre Pawlak
 * @author Juergen Hoeller
 */
public interface HierarchicalThemeSource extends ThemeSource {

    /**
     * Set the parent that will be used to try to resolve theme messages
     * that this object can't resolve.
     * @param parent the parent ThemeSource that will be used to
     * resolve messages that this object can't resolve.
     * May be {@code null}, in which case no further resolution is possible.
     */
    void setParentThemeSource(@Nullable ThemeSource parent);

    /**
     * Return the parent of this ThemeSource, or {@code null} if none.
     */
    @Nullable
    ThemeSource getParentThemeSource();

}